The Mtd 951-05531 Lawn Mower Automatic Choke Carburetor Assembly helps deliver the proper air-fuel mixture for reliable engine operation. Its automatic choke assists with adjusting the fuel mixture during starting and warm-up, supporting easier starts and smoother engine performance. The carburetor regulates fuel flow and mixes it with incoming air before combustion, helping maintain ... https://www.wholetoolbox.com/mtd-951-05531-lawn-mower-automatic-choke-carburetor-assembly-hy-5x65b/951-05531.html